Extrusion & Post
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LDPE Extrusion Temperature Fluctuation
Problem Phenomenon
The temperature controller fluctuates greatly, and product quality fluctuates accordingly.
Cause Analysis
Thermocouple failure, heater band aging, and detuned PID parameters; fluctuations in the cooling air/water circuits also interfere.
Solution
①Calibrate the thermocouple; ②Replace aged heater bands; ③PID tuning; ④Stabilize the cooling medium.
Key Takeaway
For temperature fluctuation, check the sensor and actuator first.
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